Being a graphics professional who deals with a lot of "problem" PDF files in my client-centered workflow, I immediately noticed that 6.0 deals with display and font issues that were giving me headaches in 5.1 (especially in Windows 98 and OSX, where bullets and other special symbols in fonts were displaying and even printing inconsistently) until now. This may be of limited use to other people, so I'll instead comment on my experiences with my home OSX machine, which is a rather slow G3 iMac/400 MHz. Version 6 opens no slower, measurably, than 5.1 did, as far as I can see, and renders many things more accurately - the bullet-to-generic-square issue, for instance, is now a moot point. Also, as others have pointed out, the (maybe) annoying logo can be removed and the thumbnail displays are greatly enhanced. Seems terrific to me, and if there IS a longer initial launch time, it actually opens individual files more quickly once it's been launched. Seems fine and dandy to me, kids!!